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| Primary Study on Provenance Test of Three Variants of Caribbean Pine |
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| DOI：10.16768/j.issn.1004-874X.2020.08.008 |
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| Abstract: |
| 【Objective】This research aims to make up for the shortcomings of the current narrow genetic range of Caribbean pine, broaden its genetic basis, and facilitate the development of its hybrid breeding for germplasm innovation.【Method】With a randomized complete block design, 22 provenances or batches of 3 Caribbean pine variants and slash pine germplasm were planted in Hongling Seed Orchard, Taishan City, Guangdong Province. Growth surveys were carried out after planting for 1 year and 4 years. The obtained data was used for variance analysis, multiple comparisons, genetic parameter estimation, correlation analysis and etc. 【Result】The growth differences between different tree species （variants） and provenances were extremely significant. At the age of 4 years old, the preservation rate of Cuban Caribbean pine was the lowest （44.76%）, and that of slash pine was the highest （74.95%）. The genetic parameters of the Honduran Caribbean pine with the largest number of provenances were estimated, and the results showed that the general heritability of the tree height, DBH, and volume per plant of Honduran Caribbean pine was between 0.8044 and 0.9822, indicating that the provenance selection of Honduran Caribbean pine was relatively reliable. Compared with the Taishan provenance （CK）, the Brazilian provenance of the Bahamas Caribbean pine had the best growth performance, with a single plant volume gain of 72.73%, followed by the Australian provenance of Honduran Caribbean pine, with a single plant volume gain of 65.85%. The single plant volume gains of the 3 provenances of Cuban Caribbean pine were all negative, indicating that Cuban Caribbean pine variety was not suitable for planting in Taishan.【Conclusion】Due to the narrow genetic basis of domestic Caribbean pine resources, the production of their offspring began to decline in growth. The Bahamian Caribbean pine and Honduran Caribbean pine resources introduced in this study were rich in variation. Some provenances had excellent growth performance in Taishan, which could broaden the genetic basis to a certain extent, and provide valuable materials for the creation of new germplasm of slash pine and Caribbean pine hybrid. |
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